Vertical ground motion and historical sea-level records in Dakar (Senegal)

Bibliographic Details
Title:	Vertical ground motion and historical sea-level records in Dakar (Senegal)
Authors:	Gonéri Le Cozannet, Daniel Raucoules, Guy Wöppelmann, Manuel Garcin, Sylvestre Da Sylva, Benoit Meyssignac, Médéric Gravelle, Franck Lavigne
Source:	Environmental Research Letters, Vol 10, Iss 8, p 084016 (2015)
Publisher Information:	IOP Publishing, 2015.
Publication Year:	2015
Collection:	LCC:Environmental technology. Sanitary engineering LCC:Environmental sciences LCC:Science LCC:Physics
Subject Terms:	sea-level rise, tide gauges, vertical ground motions, geodetic instruments, Dakar, African coasts, Environmental technology. Sanitary engineering, TD1-1066, Environmental sciences, GE1-350, Science, Physics, QC1-999
More Details:	With growing concerns regarding future impacts of sea-level in major coastal cities, the most accurate information is required regarding local sea-level changes with respect to the coast. Besides global and regional sea-level changes, local coastal vertical ground motions can substantially contribute to local changes in sea-level. In some cases, such ground motions can also limit the usefulness of tide-gauge records, which are a unique source of information to evaluate global sea-level changes before the altimetry era. Using satellite synthetic aperture radar interferometry, this study aims at characterizing vertical coastal ground motion in Dakar (Senegal), where a unique century-long record in Africa has been rediscovered. Given the limited number of available images, we use a stacking procedure to compute ground motion velocities in the line of sight over 1992–2010. Despite a complex geology and a rapid population growth and development, we show that the city as a whole is unaffected by differential ground motions larger than 1 mm year ^−1 . Only the northern part of the harbor displays subsidence patterns after 2000, probably as a consequence of land reclamation works. However, these ground motions do not affect the historical tide gauge. Our results highlight the value of the historical sea-level records of Dakar, which cover a 100 year time-span in a tropical oceanic region of Africa, where little data are available for past sea-level reconstructions.
Document Type:	article
File Description:	electronic resource
Language:	English
ISSN:	1748-9326
Relation:	https://doaj.org/toc/1748-9326
DOI:	10.1088/1748-9326/10/8/084016
Access URL:	https://doaj.org/article/151b5cd0d685476e950c6baf6a9044e4
Accession Number:	edsdoj.151b5cd0d685476e950c6baf6a9044e4
Database:	Directory of Open Access Journals

More Details
ISSN:	17489326
DOI:	10.1088/1748-9326/10/8/084016
Published in:	Environmental Research Letters
Language:	English